- Compute the finite differece Jacobian using coloring and show contours of matrices and differences

Notes

Most users should not need to explicitly call this routine, as it
is used internally within the nonlinear solvers.

Developer Notes

This has duplicative ways of checking the accuracy of the user provided Jacobian (see the options above). This is for historical reasons, the routine SNESTestJacobian() use to used
for with the SNESType of test that has been removed.